Corrosion as the origin of limited lifetime of vanadium oxide-based aqueous zinc ion batteries

Yangmoon Kim, Youngbin Park, Minkwan Kim, Jimin Lee, Ki Jae Kim () and Jang Wook Choi ()
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Yangmoon Kim: Seoul National University
Youngbin Park: Seoul National University
Minkwan Kim: Seoul National University
Jimin Lee: Seoul National University
Ki Jae Kim: Konkuk University
Jang Wook Choi: Seoul National University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Aqueous zinc ion batteries are receiving increasing attention for large-scale energy storage systems owing to their attractive features with respect to safety, cost, and scalability. Although vanadium oxides with various compositions have been demonstrated to store zinc ions reversibly, their limited cyclability especially at low current densities and their poor calendar life impede their widespread practical adoption. Herein, we reveal that the electrochemically inactive zinc pyrovanadate (ZVO) phase formed on the cathode surface is the main cause of the limited sustainability. Moreover, the formation of ZVO is closely related to the corrosion of the zinc metal counter electrode by perturbing the pH of the electrolyte. Thus, the dissolution of VO2(OH)2−, the source of the vanadium in the ZVO, is no longer prevented. The proposed amalgamated Zn anode improves the cyclability drastically by blocking the corrosion at the anode, verifying the importance of pH control and the interplay between both electrodes.

Date: 2022
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DOI: 10.1038/s41467-022-29987-x

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